14 warrior in Freeport:
You have Mangle and Wound. Get those as upgraded as you can.
Look for double ^^ green group mobs. Shin'Rae Avengers near Freeport station and Wailing caves are a good choice. Better yet if you find you can deal with it, is to go into the Wailing Caves. The little spiders and pawns in there are good for quests, requisitions, and for loot. Double ^^ green group stuff is a warriors friend until you are 18. Avoid the spiritists or other casters until you can handle them.
You should be able to go all the way up to the advisor solo, leveling as you go, finishing several quests. 17-18 before you have to leave. Decent adept drops, but common anymore. All in all though, the group con mobs drop better loot, and if you solo them like you can, you get it all. It is lots of fun to smoke the 6 man foundry group until you get the named blacksmith by yourself. None of my casters can do that...
18th seemed to mark the end of solo'ing group con mobs for my warrior, but its possible I didn't find the right one.